#include <bits/stdc++.h>
using namespace std;
 
int a[100][100],b[100][100];
long c[100][100];
 
int main() {
	int ar,ac,br,bc;
	while(cin>>ar>>ac>>br>>bc){
		if(ac!=br){
			cout<<"Error\n";continue;
		}for(int i=0;i<ar;i++)for(int j=0;j<ac;j++)cin>>a[i][j];
		for(int i=0;i<br;i++)for(int j=0;j<bc;j++)cin>>b[i][j];
		//for(int i=0;i<ar;i++){for(int j=0;j<ac;j++)cout<<a[i][j]<<" ";cout<<"\n";}
		//for(int i=0;i<br;i++){for(int j=0;j<bc;j++)cout<<b[i][j]<<" ";cout<<"\n";}
		for(int i=0;i<ar;i++)for(int j=0;j<bc;j++){
			c[i][j]=0;
			for(int k=0;k<ac;k++){
				c[i][j]+=(long)a[i][k]*b[k][j];
			}
		}for(int i=0;i<ar;i++){for(int j=0;j<bc;j++) cout<<c[i][j]<<" "; cout<<"\n";}
	}
}

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MyAyIDIgMwoxIDIKMyA0CjUgNgoxIDIgMwo0IDUgNgoxIDIgMyA0

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1 2
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5 6
1 2 3
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1 2 3 4